12. A CHS linebacker delivers a hit to LCHS's 82-kg running back, who was running rightward at a velocity of 5.6 m/s. The running back experiences a momentum change of 664 kg-m/s leftward during the hit. What is the running back's final velocity after the hit? Show your work as a sample calculation. Mass Initial Velocity (with sign) Final Velocity (with sign) ? Momentum Change (with sign) 13. A 0.06-kg badminton birdie travels rightward at 45 m/s and is hit by an opposing player's forehand smash (the